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@ 2022-09-13T12:57:55Z

<?php

$a1 = [
    ['v' => '13', 't' => '2015-09-08 18:50:00'],
    ['v' => '25', 't' => '2015-09-08 19:00:00'],
    ['v' => '34', 't' => '2015-09-08 19:05:00'],
    ['v' => '24', 't' => '2015-09-08 19:10:00']
];

$a2 = [
    ['v' => '10', 't' => '2015-09-08 18:50:00'],
    ['v' => '29', 't' => '2015-09-08 18:55:00'],
    ['v' => '17', 't' => '2015-09-08 19:00:00']
];

$result =[];
foreach ($a1 as $row) {
    $result[$row['t']] = [
        'v1' => $row['v'],
        'v2' => null,
        't' => $row['t']
    ];
}
foreach ($a2 as $row) {
    if (isset($result[$row['t']])) {
        $result[$row['t']]['v2'] = $row['v'];
    } else {
        $result[$row['t']] = [
            'v1' => null,
            'v2' => $row['v'],
            't' => $row['t']
        ];
    }
}
ksort($result);
var_export(array_values($result));

Output for git.master_jit, git.master, rfc.property-hooks: array ( 0 => array ( 'v1' => '13', 'v2' => '10', 't' => '2015-09-08 18:50:00', ), 1 => array ( 'v1' => NULL, 'v2' => '29', 't' => '2015-09-08 18:55:00', ), 2 => array ( 'v1' => '25', 'v2' => '17', 't' => '2015-09-08 19:00:00', ), 3 => array ( 'v1' => '34', 'v2' => NULL, 't' => '2015-09-08 19:05:00', ), 4 => array ( 'v1' => '24', 'v2' => NULL, 't' => '2015-09-08 19:10:00', ), )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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